The Slaves of Heaven (1974)

They were the Night Comers. No one could say if they were ghosts or gods or devils. They only knew they came from the sky, silver clad, ominous, with a Medusa glance that could freeze a man in his tracks. They stole women and carried them off to heaven, decimating the Earth's population and threatening the survival of the human species. Berry, chief of the Londos clan, frustrated by the uselessness of his tribes' primitive weapons, ventures into the inner circle of the Night Comers and is spirited away in their ship to their home in the stars. There, Berry's fight for survival holds the key to the existence of his own world and that of the Night Comers as well.